DENSITY AND RELATIVE DENSITY OF LIGHT HYDROCARBONS BY PRESSURE THERMOHYDROMETER: ASTM D1657
(Equivalent Test Methods: IP 235, ISO 3993, and AFNOR M41-008)
EXPLANATION
This test method covers the determination of the density or relative density of light hydrocarbons including liquid petroleum gas having Reid vapor pressure exceeding 101.325 kPa. The prescribed apparatus should not be used for materials having vapor pressures higher than 1.4 MPa at the test temperature.
TEST SUMMARY
The apparatus is purged with a portion of the sample before filling with the portion of the sample to be tested. The pressure cylinder is filled to a level at which the enclosed hydrometer floats freely. The hydrometer reading and the temperature of the sample are noted.
TEST PRECISION
Repeatability: 1 kg/m3
Reproducibility: 3 kg/m3
Bias of this test method has not been determined.
